1.Principles of LED Lights

LED, the English full name is Light Emitting Diode. Its basic structure is a piece of electroluminescent semiconductor material, a solid-state semiconductor device, which can directly convert electricity into light. It is placed on a shelf with leads, and then sealed with epoxy resin around it to protect the inner core wire, so the LED has good seismic performance.

The heart of the LED is a semiconductor chip. One end of the chip is attached to a bracket, and the other end is connected to the positive pole of the power supply, so that the entire chip is encapsulated by epoxy resin. The semiconductor wafer is composed of two parts, one part is a P-type semiconductor, in which holes dominate; the other end is an N-type semiconductor, here are mainly electrons. But when these two semiconductors are connected, a P-N junction is formed between them. 　　

When the current acts on the chip through the wire, the electrons will be pushed to the P area, where the electrons and holes recombine, and then emit energy in the form of photons. This is the principle of LED light emission. The wavelength of light is also the color of light, which is determined by the material forming the P-N junction.

2. Features　

LED fluorescent lamp adopts the latest LED light source technology, digital appearance design, energy saving up to 70% or more, 12W LED fluorescent light intensity is equivalent to 40W fluorescent tube, LED lights mainly have the following characteristics: 　　

1) Energy saving and long life. 　

2) Good applicability. Because of the small size of a single LED, it can be made into any shape. 　　

3) The response time is short, it is the response time of nanosecond level, while the response time of ordinary lamps and lanterns is millisecond level. 　　

4) Environmental protection, no harmful metals, and easy recycling of waste. 　　

5) The color is brilliant, the luminous color is pure, the spectral range is narrow, and can be mixed into colorful or white light through the three primary colors of red, green and blue.

3. Application 　　

Initially, LEDs were used as indicator light sources for instruments and meters. Later, LEDs of various light colors were widely used in traffic signal lights and large-area display screens, resulting in good economic and social benefits. Automotive signal lights are also an important field of LED light source applications. Because of the fast response speed of LEDs, drivers of vehicles following the vehicle can be informed of the driving conditions as early as possible, thereby reducing the occurrence of rear-end collisions. In addition, LED lights have been used in outdoor red, green, and blue full-color display screens, key ring type miniature flashlights and other fields.